Shafts are easily bent back straight. Setup a dial gauge and you can bend the shaft back straight. Most times any used shaft will have a slight bend anyway. Ebay will be a best bet to find used advancer. They did change the advance curve throughout the years but any year will fit.
Thanks Dirt…..two problems with mine, first, its broken; second, the end is worn and doesn't catch well. Having a real hard time finding this little part.